Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7787945 | Carbohydrate Polymers | 2015 | 8 Pages |
Abstract
This research discusses the acetylation of cotton cellulose with acetic anhydride without solvents. The acetylation was done in the presence of different amounts of N-Iodosuccinimide (NIS) as a catalyst; this took place under mild reaction conditions. The extent of acetylation was measured by the weight percent gain (WPG) that varied from 24.71 to 71.83%. Cotton cellulose acetates, with the degree of substitution (DS) that ranged from 0.89 to 2.84, were prepared in one step. The cellulose triacetate, with a degree of substitution (DS) 2.84, was obtained. The WPG and DS were easily controlled by changing the reaction duration (1-5Â h), and the concentration of the catalyst (0.05Â g, 0.075Â g and 0.10Â g for 1Â g of cellulose) in 25Â ml of acetic anhydride. NIS was recognized as a novel and more successful catalyst for the acetylation of hydroxyl groups in cotton cellulose. Formation of the acetates and the calculation of the degree of substitution were performed by FT-IR, Raman, and 1H NMR.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Ahmed El Nemr, Safaa Ragab, Amany El Sikaily, Azza Khaled,